Miner&#39;s safety-lamp.



E. F. KOEHLER.

MINERS SAFETY LAMP.

APPLIOATION FILED 001'. 28. 1912.

. 1,132,522, Patented Mar. 16, 1915.

THE NORRIS PETERS CO, PHOTO-LITHO.. WASHING I N. D. C.

ERNEST E-;K0EHI.EE, OF HUDSON, MASSACHUSETTS, ASSIGNOR, BY MESNE ASSIGN- MENTS, To E. H. KINGSBUBY, AGENT, 0E MARLBOROUGH, MASSACHUSETTS.

MINERS SAFETY-LAMP.

4 Specification of Letters Patent.

Patented Mar. 16, 1915.

Application filed. October 28, 1912. Serial N 0. 728,154.

at 3 (Fig. 1). In order to attach and-detach H To all 'wlz am it may concern Be it known that I, ERNEST F. KOEHLER, a subject of the Emperor of Germany, residing in Hudson, county of Middlesex, and State of Massachusetts, have invented certain new and useful Improvements in Miners Safety-Lamps; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The present invention relates to miners safety'lamps and more particularly to that class of miners safety lamp provided with a magnetic lock for preventing the unauthorized separation of the parts of the lamp. As heretofore constructed lamps of this class are locked by a cooperating pin and socket. Owing to the hard usage which these lamps receive in the hands of the miners the lamps often become unlocked in the mines owing to the breakage of the pin or the spring which actuates the pin to engage the socket.

The object of the present invention is to provide a miners safety lamp with a magnetic lock having a simplified and improved construction and mode of operation whereby the danger of the lamp unlocking in the mine on account of breakage of the parts of the lamp is obviated.

T o the accomplishment of this object and such others as may hereinafter appear, the features of the invention relate to certain devices, combinations and arrangements of parts, hereinafter described and then set forth in the appended claims, which possess advantages which will be apparent to those skilled in the art.

The various features of the present invention will be best understood from an inspection of the accompanying drawings illustrating the preferred embodiment of the invention, in which,

Figure 1 is an elevation of a miners safety lamp portions being broken out and shown in section; Fig. 2 is a sectional detail on the line 2'2, Fig. 1; Fig. 3 is a detail in reverse plan of the upper horizontal face of the detachable base portions of the lamp, andFig. 4 is a sectional detail on the line H, Fig. 2.

In the illustrated embodiment of the invention the lamp consists of a body portion 1 and a detachable base portion 2 having a horizontal line of parting indicated generally the base portion the lower end of the body portion and the upper end of the'base por-' tion are respectively provided with exterior and interior threads 4 and 5 by means of which the base portion may be threaded upon the body portion. In order to lock the base portion to the body portion in such a manner as to prevent the unauthorized separation of the base portion from the body portion the lamp is provided with a magnetic lock. One of the members of the lock consists of two sockets 6 and 7 formed in the upper horizontal face of the base portion at different distances from the median line of the lamp. The other member of the lock consists of two pins 8 and 9 arranged to respectively engage the sockets 6 and 7 when thebase portion 2 is attached to the body portion. The pins 8 and 9 depend from a horizontal bar 10 which is movably mounted within a cavity 11 formed in the body portion 1. The pins 8 and 9 are normally maintained projected through holes 12 and 13 formed in a plate 14, secured to the lower horizontal face of the body portion 1, by a spring 15 which is coiled around a lug 16 formed on the bar 10 and interposed between the upper surface of the bar 10 and a cover 17 for the cavity 11. With this construction when the base portion is screwed upon the body portion the pins 8 and 9 are gradually elevated against the tension of the spring 15 until the sockets 6 and 7' are brought beneath the pins at which time they engage the sockets under the influence of the spring 15.

In order to unlock the lamp the plate 17 is brought into proximity to a powerful electric magnet which withdraws magnetically the pins 8 and 9 from the sockets 6 and 7. To aid in the magnetic unlocking of the lamp the body portion of the lamp carries a pair of rigid steel or iron pins 18 which are arranged in the vertical plane of the pins 8 and 9. Preferably the median line of each of the pins 18 substantially coincides with the median line of the pins locked relation does not depend upon the. spring 15, but that if the spring should break the pins 8 and 9 would remain in engagement with the sockets 6 and 7 under the influence of gravity. It will also be apparent that the breaking of one pin Will not cause the lamp to unlock and that the arrangement of the sockets at diflerent distances from the median line of the lamp permits the breaking of one pin Without interfering With the operation of the other.

What is claimed as new, is:

1. A miners safety lamp, having, in combination, a body portion and a detachable base portion having a horizontal parting, and a magnetic lock for locking the base portion to the body portion, one member of the lock consisting of a pair of sockets formed in the base portion of the lamp, and the other member of the lock consisting of a horizontal bar movably mounted in the body portion, a pair of vertical pins depending from the bar arranged to engage the sockets in the base portion, and a pair of vertical pins rigidly mounted in the body portion and having their median lines substantially coinciding respectively with the median lines of the pins in the bar, substantially as described.

2. A miners safety lamp, having, in combination, a body portion and a detachable base portion having a horizontal parting, and a magnetic lock for locking the base portion to the body portion, one member of the lock consisting of a pair of sockets formed in the base portion of the lamp and the other member of the lock consisting of a horizontal bar movably mounted in the body portion, a pair of vertical pins depending from the bar arranged to engage the sockets in the base portion, a spring for actuating the pins to engage the sockets, said pins being constructed and arranged to maintain their engagement With the sockets under the influence of gravity when the spring is broken, and a pair of vertical pins rigidly mounted in the body portion and having their median lines substantially coinciding respectively With the median lines of the pins in the bar, substantially as described.

ERNEST F. KOEHLER.

Witnesses BIoN B. LIBBY, GRACE A. DEVER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents Washington, D. 0. 

